SYSTEM AND METHOD FOR UPLINK MULTIPLE INPUT MULTIPLE OUTPUT TRANSMISSION

• US 20120281642A1
• Filed: 11/07/2011
• Published: 11/08/2012
• Est. Priority Date: 11/08/2010
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sambhwani, Sharad Deepak, Akkarakaran, Sony John
• Application Number:
  US13/291,040
• Publication Number:
  US 20120281642A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels

Abstract

Methods and apparatuses are provided for uplink MIMO transmissions in a wireless communication system. In particular, scheduled uplink transmission power is allocated between a primary stream including an E-DPDCH and a secondary stream including an S-E-DPDCH. Specifically, a ratio between the power of the E-DPDCH and a primary pilot channel DPCCH, as well as a ratio between the power of the S-E-DPCCH and an unboosted power of the S-DPCCH, each corresponds to a first traffic to pilot power ratio. Further, the transport block size for a primary transport block provided on the E-DPDCH is determined based on the first traffic to pilot power ratio, while the transport block size for a secondary transport block provided on the S-E-DPDCH is determined based on a second traffic to pilot power ratio.

Claims

1. A method of wireless communication, comprising:

receiving a primary scheduling grant comprising a first traffic to pilot power ratio;

transmitting a primary stream comprising a first data channel and a first pilot channel, wherein a ratio between a power of the first data channel and a power of the first pilot channel corresponds to the first traffic to pilot power ratio; and

transmitting a secondary stream comprising a second data channel, wherein a ratio between a power of the second data channel and an unboosted power of a second pilot channel corresponds to the first traffic to pilot power ratio,

wherein the primary stream and the secondary stream are in the same carrier.

2. The method of claim 1, wherein the transmitting of the secondary stream comprises transmitting the second pilot channel at a boosted power relative to the unboosted power.

3. The method of claim 1, further comprising:

receiving a secondary scheduling grant comprising a second traffic to pilot power ratio;

determining a first packet size to be utilized in a transmission on the primary stream in accordance with the first traffic to pilot power ratio; and

determining a second packet size to be utilized in a transmission on the secondary stream in accordance with the second traffic to pilot power ratio.

4. The method of claim 3, wherein the power of the second data channel is independent of the second traffic to pilot power ratio.

5. The method of claim 3, further comprising:

scaling the power allocated to the primary stream and the power allocated to the secondary stream in accordance with a power headroom limit;

scaling the first packet size in accordance with the scaling of the power; and

determining a second scaled packet size to be utilized in a transmission on the secondary stream in accordance with the scaled power.

6. The method of claim 5, wherein the determining of the second scaled packet size comprises looking up a value for the second scaled packet size in a lookup table corresponding to a scaling constant utilized for the scaling of the power.

7. The method of claim 1, wherein a boosted power of the second pilot channel is offset from the power of the first pilot channel in accordance with a received offset value.

8. The method of claim 7, wherein the transmitting of the secondary stream comprises transmitting the second pilot channel at the boosted power.

9. The method of claim 8, wherein the boosted power of the second pilot channel is offset from the power of the second data channel.

10. The method of claim 1, wherein the unboosted power of the second pilot channel is equal to the power of the first pilot channel, such that the power of the first data channel and the power of the second data channel are equal to one another.

11. An apparatus for wireless communication, comprising:

means for receiving a primary scheduling grant comprising a first traffic to pilot power ratio;

means for transmitting a primary stream comprising a first data channel and a first pilot channel, wherein a ratio between a power of the first data channel and a power of the first pilot channel corresponds to the first traffic to pilot power ratio; and

means for transmitting a secondary stream comprising a second data channel, wherein a ratio between a power of the second data channel and an unboosted power of a second pilot channel corresponds to the first traffic to pilot power ratio,

wherein the primary stream and the secondary stream are in the same carrier.

12. The apparatus of claim 11, wherein the means for transmitting the secondary stream comprises means for transmitting the second pilot channel at a boosted power relative to the unboosted power.

13. The apparatus of claim 11, further comprising:

means for receiving a secondary scheduling grant comprising a second traffic to pilot power ratio;

means for determining a first packet size to be utilized in a transmission on the primary stream in accordance with the first traffic to pilot power ratio; and

means for determining a second packet size to be utilized in a transmission on the secondary stream in accordance with the second traffic to pilot power ratio.

14. The apparatus of claim 13, wherein the power of the second data channel is independent of the second traffic to pilot power ratio.

15. The apparatus of claim 13, further comprising:

means for scaling the power allocated to the primary stream and the power allocated to the secondary stream in accordance with a power headroom limit;

means for scaling the first packet size in accordance with the scaling of the power; and

means for determining a second scaled packet size to be utilized in a transmission on the secondary stream in accordance with the scaled power.

16. The apparatus of claim 15, wherein the means for determining the second scaled packet size comprises means for looking up a value for the second scaled packet size in a lookup table corresponding to a scaling constant utilized for the scaling of the power.

17. The apparatus of claim 11, wherein a boosted power of the second pilot channel is offset from the power of the first pilot channel in accordance with a received offset value.

18. The apparatus of claim 17, wherein the means for transmitting the secondary stream comprises means for transmitting the second pilot channel at the boosted power.

19. The apparatus of claim 17, wherein the boosted power of the second pilot channel is offset from the power of the second data channel.

20. The apparatus of claim 11, wherein the unboosted power of the second pilot channel is equal to the power of the first pilot channel, such that the power of the first data channel and the power of the second data channel are equal to one another.

21. A computer program product, comprising:

a computer-readable medium comprising instructions for causing a computer to;

receive a primary scheduling grant comprising a first traffic to pilot power ratio;

transmit a primary stream comprising a first data channel and a first pilot channel, wherein a ratio between a power of the first data channel and a power of the first pilot channel corresponds to the first traffic to pilot power ratio; and

transmit a secondary stream comprising a second data channel, wherein a ratio between a power of the second data channel and an unboosted power of a second pilot channel corresponds to the first traffic to pilot power ratio,

wherein the primary stream and the secondary stream are in the same carrier.

22. The computer program product of claim 21, wherein the instructions for causing a computer to transmit the secondary stream comprise instructions for causing a computer to transmit the second pilot channel at a boosted power relative to the unboosted power.

23. The computer program product of claim 21, wherein the computer-readable medium further comprises instructions for causing a computer to:

receive a secondary scheduling grant comprising a second traffic to pilot power ratio;

determine a first packet size to be utilized in a transmission on the primary stream in accordance with the first traffic to pilot power ratio; and

determine a second packet size to be utilized in a transmission on the secondary stream in accordance with the second traffic to pilot power ratio.

24. The computer program product of claim 23, wherein the power of the second data channel is independent of the second traffic to pilot power ratio.

25. The computer program product of claim 23, wherein the computer-readable medium further comprises instructions for causing a computer to:

scale the power allocated to the primary stream and the power allocated to the secondary stream in accordance with a power headroom limit;

scale the first packet size in accordance with the scaling of the power; and

determine a second scaled packet size to be utilized in a transmission on the secondary stream in accordance with the scaled power.

26. The computer program product of claim 25, wherein the determining of the second scaled packet size comprises looking up a value for the second scaled packet size in a lookup table corresponding to a scaling constant utilized for the scaling of the power.

27. The computer program product of claim 21, wherein a boosted power of the second pilot channel is offset from the power of the first pilot channel in accordance with a received offset value.

28. The computer program product of claim 27, wherein the instructions for causing a computer to transmit the secondary stream comprise instructions for causing a computer to transmit the second pilot channel at the boosted power.

29. The computer program product of claim 28, wherein the boosted power of the second pilot channel is offset from the power of the second data channel.

30. The computer program product of claim 21, wherein the unboosted power of the second pilot channel is equal to the power of the first pilot channel, such that the power of the first data channel and the power of the second data channel are equal to one another.

31. An apparatus for wireless communication, comprising:

a transmitter for transmitting a primary stream and a secondary stream;

at least one processor for controlling the transmitter; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to;

receive a primary scheduling grant comprising a first traffic to pilot power ratio;

transmit a primary stream comprising a first data channel and a first pilot channel, wherein a ratio between a power of the first data channel and a power of the first pilot channel corresponds to the first traffic to pilot power ratio; and

transmit a secondary stream comprising a second data channel, wherein a ratio between a power of the second data channel and an unboosted power of a second pilot channel corresponds to the first traffic to pilot power ratio,

wherein the primary stream and the secondary stream are in the same carrier.

32. The apparatus of claim 31, wherein the transmitting of the secondary stream comprises transmitting the second pilot channel at a boosted power relative to the unboosted power.

33. The apparatus of claim 31, wherein the at least one processor is further configured to:

receive a secondary scheduling grant comprising a second traffic to pilot power ratio;

determine a first packet size to be utilized in a transmission on the primary stream in accordance with the first traffic to pilot power ratio; and

determine a second packet size to be utilized in a transmission on the secondary stream in accordance with the second traffic to pilot power ratio.

34. The apparatus of claim 33, wherein the power of the second data channel is independent of the second traffic to pilot power ratio.

35. The apparatus of claim 33, wherein the at least one processor is further configured to:

scale the power allocated to the primary stream and the power allocated to the secondary stream in accordance with a power headroom limit;

scale the first packet size in accordance with the scaling of the power; and

determine a second scaled packet size to be utilized in a transmission on the secondary stream in accordance with the scaled power.

36. The apparatus of claim 35, wherein the determining of the second scaled packet size comprises looking up a value for the second scaled packet size in a lookup table corresponding to a scaling constant utilized for the scaling of the power.

37. The apparatus of claim 31, wherein a boosted power of the second pilot channel is offset from the power of the first pilot channel in accordance with a received offset value.

38. The apparatus of claim 37, wherein the transmitting of the secondary stream comprises transmitting the second pilot channel at the boosted power.

39. The apparatus of claim 38, wherein the boosted power of the second pilot channel is offset from the power of the second data channel.

40. The apparatus of claim 31, wherein the unboosted power of the second pilot channel is equal to the power of the first pilot channel, such that the power of the first data channel and the power of the second data channel are equal to one another.